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ABOUT THIS IMAGE:

Resembling the fury of a raging sea, this image actually shows a bubbly
ocean of glowing hydrogen gas and small amounts of other elements such
as oxygen and sulfur.

The photograph, taken by NASA's Hubble Space Telescope, captures a small
region within M17, a hotbed of star formation. M17, also known as the
Omega or Swan Nebula, is located about 5,500 light-years away in the
constellation Sagittarius. The image is being released to commemorate
the thirteenth anniversary of Hubble's launch on April 24, 1990.

The wave-like patterns of gas have been sculpted and illuminated by a
torrent of ultraviolet radiation from young, massive stars, which lie
outside the picture to the upper left. The glow of these patterns
accentuates the three-dimensional structure of the gases. The ultraviolet
radiation is carving and heating the surfaces of cold hydrogen gas clouds.
The warmed surfaces glow orange and red in this photograph. The intense
heat and pressure cause some material to stream away from those surfaces,
creating the glowing veil of even hotter greenish gas that masks
background structures. The pressure on the tips of the waves may trigger
new star formation within them.

The image, roughly 3 light-years across, was taken May 29-30, 1999, with
the Wide Field Planetary Camera 2. The colors in the image represent
various gases. Red represents sulfur; green, hydrogen; and blue, oxygen.